Exceptionalism is atavistic. People who should know better, sophisticated postmodern intellectuals, love it.
It is also atavistic in its direct appeal to the ancestors.
It is not that I am particularly immune to this rhetoric. I just think it is advantageous to step outside it. I am not interested in developing my own version or refining the best existing version of it even further.
I propose another test: you might describe an exceptionalism without identifying it, pseudonymously. Then evaluate it. Only then, "lift the veil" to see what you have. In other words, you would have to evaluate it without knowing whether it is a progressive or Fascist form of cultural nationalism.